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FILE No.
SERVICE MANUAL
STAINLESS STEEL
MICROWAVE OVEN WITH GRILL
EM-SL20NECO
MIN
SEC
AUTO
150w
MIN
450w
SEC
AUTO
C
150w
450w
C
/
Kg
/
Kg
Product Code No.
EM-SL20NECO
1-437-574-25
FOREWORD
Read this manual carefully, especially precaution on microwave energy, and follow the procedure
strictly. Careless servicing and testing may expose yourself to the microwave energy leakage.
PRECAUTIONS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID
POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or
other microwave source, and make repairs if necessary:
(1) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and
otherdamage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or
abuse.
(c) Before turning on microwave power for any service test or inspection within the
microwave generating compartments, check the magnetron, wave-guide or transmission line,
and cavity for proper alignment, integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures
described in this manual before the oven is released to the owner.
REFERENCE No. SM-2400005
TABLE OF CONTENTS
Adjustment Procedures........................................1
Circuit Diagram.................................................... 4
Specifications....................................................... 2
Test Procedures and Troubleshooting................. 5-12
Power Output Measurement................................ 2
Disassembly Instructions..................................... 13-14
Precautions and Repair Service Tips...................2
Exploded View and Parts list................................15-19
Oven Control Panel..............................................3
Control Circuit Board............................................20
Overall Circuit Diagrams...................................... 21
CAUTION
MICROWAVE ENERGY
PERSONNEL SHOULD NOT BE EXPOSED TO
THE MICROWAVE ENERGY WHICH MAY RADIATE FROM THE MAGNETRON OR OTHER
MICROWAVE GENERATING DEVICE IF IT IS
IMPROPERLY USED OR CONNECTED. ALL
INPUT AND OUTPUT MICROWAVE CONNECTIONS, WAVE GUIDES, FLANGES, AND GASKETS MUST BE SECURE. NEVER OPERATE
THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER
LOOK INTO AN OPEN WAVE GUIDE OR
ANTENNA WHILE THE DEVICE IS ENERGISED.
Lever Stopper
1. ADJUSTMENT PROCEDURES
TO AVOID POSSIBLE EXPOSURE TO MICRO-WAVE
ENERGY LEAKAGE, THE FOLLOWING ADJUSTMENT OF THE INTERLOCK SWITCHES SHOULD
BE MADE ONLY BY AUTHORISED SERVICE
PERSONNEL
Screw
Positions
Door Latch
PRIMARY INTERLOCK SWITCH, DOOR SENSING
SWITCH AND INTERLOCK MONITOR SWITCH
ADJUSTMENT
(Figure 1)
Door Sensing
Switch
(1) Loosen 2 screws securing the lever stopper.
(2) Adjust the lever stopper position so that it is pushed
up and pull forward until there is about zero gap.
2-1. Between the lever and the switch body on
the door sensing switch.
2-2. Between the lever and the switch body
on the interlock monitor switch.
2-3. Between the latch lever and the switch body
on the primary interlock switch.
when the door latch is securely locked.
(3) Tighten the lever stopper screws securely.
(4) Make sure the interlock monitor is closed after
the primary interlock switch opens when the door is
opened very slowly, according to “CHECKOUT
PROCEDURE FOR SWITCHES” on page 8.
(5) Make sure the interlock monitor is open before
the primary interlock and secondary interlock
switches close when the door is closed very slowly,
according to “CHECKOUT PROCEDURE FOR
SWITCHES” on page 8.
(6) Make sure the microwave energy leakage is below
the limit of the regulation (5mW/cm2) when
measured with a detector. ( All service
adjustments must be made for minimum energy
leakage readings.)
Lever
Interlock Monitor
Switch
Latch Lever
Primary Interlock
Switch
Figure 1
-1-
2. SPECIFICATIONS - EM-SL20N
Rated Power Consumption........ Micro 1450±10%W
Grill 1100+5/-10%W
Dual 2500+5/-10%W
(After 15mins.)
Microwave Output...................... 900W( Adjustable 90W
through 900W )
Frequency.................................. 2,450MHz ± 50MHz
Power Supply............................. 230V,50Hz
Rated Current.............................Micro 6.3±10% Amps
Grill 4.75+5/-10% Amps
Dual 10.9+5/-10% Amps
(After 15mins.)
Safety Devices........................... Thermal Protector for
Magnetron and Cavity,
Open at 122˚C
Thermal Protector for
Heater, Open at 150˚C
Fuse (Cartridge Type 8A)
Primary Interlock Switch
Door Sensing Switch
Interlock Monitor Switch
Timer.......................................... Electronic Digital
Overall Dimensions.............490(W)x378(D)x322(H)mm
Oven Cavity Size.................304(W)x304(D)x248(H)mm
Turntable Diameter.....................262mm
Net Weight..................................Approx. 19.0Kg.
4.PRECAUTIONS AND REPAIR SERVICE TIPS
PRELIMINARY
A.SINCE NEARLY 4,000 VOLTS EXIST IN
SOME CIRCUITS OF THIS MICROWAVE
OVEN, REPAIRS SHOULD BE CARRIED
OUT WITH GREAT CARE
B.TO AVOID POSSIBLE EXPOSURE TO
MICROWAVE ENERGY LEAKAGE, THE
FOLLOWING PRECAUTIONS MUST BE
TAKEN BEFORE SERVICING.
(1)Before the power is applied.
(a)Open and close door several times to make sure
the primary interlock switch, the door sensing switch,
and the interlock monitor switch operate properly.
(Listen for the clicking sound from switches). Make
sure the interlock monitor switch is closed after the
primary interlock switch is opened, when the door is
opened. (See pages 1 and 7).
(b)Make sure the perforated screen and the dielectric
choke of the door are correctly mounted.
(2)After the power is applied.
(a)Open and close the door to see if the interlock
mechanism operates properly.
(b)Check microwave energy leakage with a leakage
detector and confirm the energy leakage is below
5mW/cm2.
3. POWER OUTPUT MEASUREMENT
(1) Prepare 1000cc tap water in a wide mouthed Pyrex
container.
(2) Stir thoroughly and note initial water temperature T1
(˚C).
(3) Place container in centre of oven and operate for 60
seconds at full power.
(4) Remove container, stir thoroughly and note final
water temperature T2 (˚C).
(5) Calculate power output= 70 x Temp. rise (T2-T1).
NOTE: This is only an approximate test method, not
IEC705 test method to which the microwave oven has
been tested and rated.
(3)Do not operate the unit until it is completely
repaired, if any of the following conditions exists.
(a)Door does not close firmly against the cavity front.
(b)The hinge is broken.
(c)The choke dielectric or the door seal is damaged.
(d)The door is bent or warped, or there is any other
visible damage to the oven that may cause
microwave energy leakage.
NOTE: Always keep the seal clean
(e)Make sure there are no defective parts in the
microwave generating and transmission assembly.
(especially waveguide).
(4)Following items should be checked after the unit is
repaired.
(a)The interlock monitor switch is connected
correctly and firmly.
(b)The magnetron gasket on the magnetron is
properly positioned.
(c)Wave guide and oven cavity are intact ( no leakage
of microwave energy).
(d)The door can be properly closed and the safety
switches work properly.
(e)The oven must be stopped when the door is
opened or the time is up.
The oven must not be operated with any of the above
components removed or bypassed.
-2-
5. OVEN CONTROL PANEL
1
2
MIN
SEC
3
4
AUTO
5
7
6
150w
450w
8
9
10
C
11
12
13
/
Kg
14
Figure 1
KEYS:
1. Display Window
2. Function and Accessary Indicator
3. Kitchen Timer Display
4. Auto Program Key
5. Auto-Defrost
6. Kitchen Timer Key
7. More/Less Key
8. Personal Menu Keys
9. MIcro Power
10. Delay Start
11. Quick Start
12. Clear/Stop
13. Start
14. Rotary Dial
Notes :
A "beep tone" sounds when a "pad" on the control panel is touched, to indicate a setting has
been entered.
When setting the controls you can keep your finger on a key until the desired setting is reached.
-3-
6.CIRCUIT DIAGRAM
EM-SL20N
230V ~
50Hz
OVEN CONDITION
DOOR : OPEN
L1,L2 = 1mH
C1 = 0.22 F
C2,C3 = 4700PF
R = 1M
C1
R
TOUCH KEY
BOARD
L2
L1
C2
C3
S101
S1
ST
COM
5
SC1
RL1
NO
L
1
MTCO/
CFTCO(122ûC)
GM
3
FUSE (8A T)
BM
RL4
CONTROL
CIRCUIT
BOARD
RL3
HT(150ûoC)
RL2
H
IR (25 )
SC3
21
NC
COM
NO
SC2
HIGH VOLTAGE TRANSFORMER
COM
MAGNETRON 2M-253H(IF)-N
H.V. FUSE 0.75A
1.14 F
HIGH VOLTAGE RECTIFIER
HIGH VOLTAGE CONDENSER
2x500PF/2x1.5uH
SC1 : PRIMARY INTERLOCK SWITCH
SC2 : DOOR SENSING SWITCH
SC3 : INTERLOCK MONITOR SWITCH
MTCO/CFTCO : MAGNETRON/CAVITY FIRE
THERMAL CUT OUT
HT : HEATER THERMOSTAT
RL1 : MAIN RELAY
RL2 : POWER CONTROL RELAY
RL4 : GRILL HEATER RELAY
BM : BLOWER MOTOR
GM : GEAR MOTOR
L
: CAVITY LAMP
ST : STEP DOWN TRANSFORMER
IR : INRUSH RESISTOR
- The parts marked with
are supplied with
a high voltage which exceeds 250V.
- The parts marked with
have special characteristics important for macrowave leakage.
When replacing any of these parts use only
manufacturer's specified parts.
-4-
7. TEST PROCEDURES AND TROUBLESHOOTING
Filament Windings
CAUTION
- DISCONNECT THE POWER SUPPLY
CORD FROM THE WALL OUTLET
WHENEVER REMOVING THE CABINET
FROM THE UNIT. PROCEED WITH THE
TESTS ONLY AFTER DISCHARGING
THE HIGH VOLTAGE CAPACITOR AND
REMOVING THE LEAD WIRES FROM
THE PRIMARY WINDING OF THE HIGH
VOLTAGE TRANSFORMER. ( See
Figure 3 )
Secondary Winding
Primary Windings
Figure 4
A. TEST PROCEDURE
COMPONENT
CHECKOUT PROCEDURE
1) Check for resistance : Across the filament terminals of the
the magnetron with an ohmmeter on Rx1 scale.
RESULTS
Normal reading :
Less than 1 ohm.
Figure 5
2) Check for resistance : Across the filament terminals of
the magnetron and the chassis ground with an ohm-meter
on highest scale.
MAGNETRON
Figure 6
The chart below shows the firing times of the variable power
relay for the EM-SL20 model. The table should be used as
a means to check the magnetron is operating correctly and
producing any other power setting apart from full power.
Power Level
High (900W)
M-High(750W)
Roast (450W)
Simmer(300W)
Warm (150W)
Low (80W)
On Time/s
% On Time
(inc.’ramp up’ time)
30.0
100
28.0
93
18.0
60
13.0
43
8.0
27
6.0
20
-5-
Normal reading :
Infinite ohms
COMPONENT
HIGH
VOLTAGE
TRANSFORMER
CHECKOUT PROCEDURE
RESULTS
1) Measure the resistance :
With an ohmeter on Rx1 scale.
a. Primary Winding ;
b. Filament Winding ;
c. Secondary Winding ;
2) Measure the resistance :
With an ohm-meter on highest scale.
a. Primary winding to ground ;
b. Filament winding to ground ;
Normal readings :
Approximately 1.75 ohms.
Less than 1 ohm.
Approximately 90.11 ohms.
Normal readings :
Infinite ohms
Infinite ohms
Note : Remove varnish of
measured point.
Figure 7
1) Measure the resistance : Across two terminals with an
ohm-meter on highest scale
HIGH VOLTAGE
CAPACITOR
including
BLEEDER
RESISTOR
Normal reading :
Momentarily indicates several
ohms, and gradually returns
to 10 Meg-ohm.
Abnormal reading :
Indicates continuity or 10MΩ
from the beginning.
Figure 8
Measure the resistance : Across two terminals with an
ohm-meter on its highest scale.
HIGH
VOLTAGE
DIODE
Figure 9
Normal reading :
Indicates over 10MΩ in one
direction (forward direction)
and infinite ohms in the
reverse direction, using meter
which is provided with a 9-volt
battery.
NOTE
Some digital meters may
show over even in a forward
direction because low
measuring voltage of meter
does not allow the meter
current to pass through
the high voltage diode.
Abnormal reading:
Indicates continuity or infinite
ohms in both directions.
-6-
COMPONENT
CHECKOUT PROCEDURE
RESULTS
Measure the resistance : Across two terminals with an
ohm-meter on its highest scale.
Normal reading :
Indicates continuity.
HV FUSE
Abnormal reading :
Indicates infinite ohms.
Figure 10
CONTROL
CIRCUIT
BOARD
COMPLETE
Measure the voltage : Between test points TP-1,TP-2,
and ground (See control circuit board on page 20 ).
NOTE
Proceed with the check of the step down transformer, to
see if any one of the measured values is different from the
specified values
-7-
Test TP-1 TP-2
point
Voltage -5V -15V
DC DC
CHECKOUT PROCEDURE FOR SWITCHES
Disconnect the lead wires from the switches and check the continuity of the switches, connecting an ohm-meter to its
terminals.
SWITCH
CHECKOUT PROCEDURES
DOOR OPEN DOOR CLOSE
Primary Interlock
Connect an ohm-meters leads to terminals "COM"
and "NO" of switch
Door Sensing
Interlock monitor
Connect an ohm-meters leads to terminals "COM"
and "NC" of switch
CAUTION : After checking the switches, make sure that the interlock monitor switch is properly connected according to
the CIRCUIT DIAGRAM on page 4.
-8-
-9-9-
Control
Circuit Board
Check power supply voltage
on control circuit board.
(See page 7 )
b
Check 230V AC power
supply of connector S1
between Pin3 and Pin 5
after removing connector
S1 from control circuit
board.
a
No display or mis-display in
the display window by touching
the keys.
(1) PROBLEM
STEP
B. TROUBLESHOOTING
V
V
Voltage
incorrect
0
Each Voltage
OK
0
230 Volt
0 230
0 Volt
0 230
Check continuity of FUSE,
Thermal Protector for cavity,
Thermal Protector for
magnetron and AC Power
Cord.
If the fuse has blown see
"D. REMOVING FUSE" on
page 13
SEQUENCE
Replace control
circuit board.
Correct seating of
connector S101 or
replace control circuit
board.
Replace it if
necessary
Normal control
circuit board
Normal control
circuit board
Time Start
Runs
EM-S350
100 150
450 700
850 1000
Auto Def.
Runs
PROBLEM
1-b
Runs
RESULT
-10-10-
Touch START key and measure
voltage between the two wire
leads from primary windings of
H.V transformer after removing
the wire leads from terminals of
H.V transformer
a
Oven does not heat up
(3) PROBLEM
Check continuity of connector
S102 between pins with the
door closed after removing
connector S102 from control
cct board.
0
0
0 Volt
0 230
230 Volt
0 230
No Continuity
∞
Continuity OK
∞
SEQUENCE
Check contact
of connector S102
Cooking operation will
not start.
a CHECK : 1. Power Supply to Oven
2. Primary Interlock Switch
3. Thermal protector for Cavity and Magnetron
(2) PROBLEM
STEP
Poor Contact
Contact OK
Replace Control
Circuit Board
Normal Door
Sensing Switch
Normal Contact
Normal Control
Cct. board
Adjust or Replace
Door Sensing Switch
Correct Seating
Runs
PROBLEM
3-b
Runs
Runs
PROBLEM
3a
RESULT
-11-11-
Check operation
of blower motor
when START key
is touched.
a
Low microwave power
output.
No
Operation
Normal
Operation
Check resistance of
each winding after
removing lead wires.
5
(See page 6)
(4) PROBLEM
b
STEP
0
0
Temporarily
short across
terminals of
thermal protector
for magnetron
or thermal
protector for
cavity by using
jumper lead.
Resistance
Correct
∞
Resistance
OK
∞
No
Operation
Normal
Operation
0
0
Measure resistance
of blower motor
(Approx 274 ohms)
0
Normal
Resistance
∞ 274
Resistance
incorrect
∞
Normal H.V
capacitor ,
diode or fuse.
Normal
Magnetron
Normal HV Transformer
Replace HV
capacitor, H.V
diode or H.V.
fuse.
Replace HV
Magnetron.
Replace HV
Transformer
Defective H.V capacitor,
H.V diode or H.V. fuse.
∞
Normal H.V capacitor,
H.V diode or H.V. fuse.
∞
Replace control
circuit board.
Normal control
circuit board
Replace Blower Normal Blower
Motor
motor
Normal thermal protector for
Replace thermal protector
magnetron or thermal
for magnetron or thermal
protector for cavity.
protector for cavity.
Check H.V capacitor , H.V.
diode or H.V fuse with an
ohm-meter after removing
the lead wires.( See page 76 )
SEQUENCE
Up
Time Start
Up
Time Start
Up
Time Start
Up
Time Start
Up
Time Start
Up
Time Start
Runs
Auto Def.
Runs
Auto Def.
Runs
Auto Def.
PROBLEM
3-b
Runs
Auto Def.
Runs
Auto Def.
Runs
Auto Def.
RESULT
-12-
Auto Def. Dual Grill Time Start
SEC
MIN
AUTO
Pizza
Time of day
Chilled
Meal
Up
EM-G451
Start
/
450w
C
Kg
Set power level
at low.
Down
450w
Delay
Start
Dual
150w
Pork
Chops
Dual
Chicken
Pieces
Timer/Weight
Clear/Stop
C
Power
Grill
Auto
Defrost
Jacket
Potato
D I R E C T AC C
ESS
150w
Liquid
100 150 450 700 850 1000
a
Checkresistance
resistanceofof
Check
heater.
heater.
Aproximately41.7Ω
48.7Ω
Approximately
measured
measuredover
overboth
terminals.
both
tubes.
0
Resistance
Incorrect.
∞
Normal
Resistance.
∞ 52
Touch START key and measure
voltage between leads for
primary winding of H.V transformer
after removing the wire leads from
terminals of H.V transformer.
Unit does not heat up even
if display counts down when
key is touched for
"Grill Cooking".
(6) PROBLEM
a
The magnetron operates on
high level when a lower cook
power is selected.
(5) PROBLEM
STEP
230 Volt
0 230
0 Volt
0 230
SEQUENCE
Replace Heater
Replace control
circuit board.
Normal control
circuit board
Normal Heater
Normal control
circuit board
Replace control
circuit board.
Time Start
Runs
EM-S350
100 150
450 700
850 1000
Auto Def.
Runs
Runs
No problem
Measure water
temperature rise
exactly.
RESULT
8.DISASSEMBLY INSTRUCTIONS
- OVEN MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPLACEMENTS,
REPAIRS, ADJUSTMENTS, AND CONTINUITY
CHECKS BEFORE PROCEEDING WITH ANY REPAIR
WORK AFTER DISCONNECTING. WAIT AT LEAST 1
MINUTE, UNTIL THE CAPACITOR IN THE HIGH VOLTAGE AREA HAS FULLY DISCHARGED.
- WHEN REPLACING ANY DOOR MICRO SWITCH,
REPLACE WITH THE SAME TYPE SWITCH SPECIFIED ON THE PARTS LIST.
A. REMOVING PRIMARY INTERLOCK SWITCH,
DOOR SENSING SWITCH AND INTERLOCK
MONITOR SWITCH
(See Figure 1 on page 1 and Figure 12 on this page)
(1) Remove 2 screws securing the lever stopper.
(2) Disconnect all lead wires from the primary interlock
switch, door sensing switch and the interlock monitor
switch
(3) Ease away the retaining clips holding the Primary
interlock switch onto the lever stopper and remove.
(4) Remove the door sensing switch by reference to the
step (3).
(5) Remove the interlock monitor switch by reference to
step (3).
(6) Make the necessary adjustment, and make microwave
energy leakage check according to “1. ADJUSTMENT
PROCEDURES” on page 1. After the switch is
replaced with a new one, check proper operation of it
according to “CHECKOUT PROCEDURE FOR
SWITCHES” on page 8.
LEVER STOPPER
MICROSWITCH
C. REMOVING MAGNETRON
(See exploded view on page 16 )
(1) Remove the antenna complete according to
B. REMOVING THE ANTENNA.
(2) Disconnect the 2 lead wires from the magnetron.
(3) Remove 1 screw securing the duct to the
magnetron, and take out the duct.
(7) Remove 4 screws securing the magnetron to
the waveguide.
Take out the magnetron VERY CAREFULLY.
NOTES
- When removing the magnetron, make sure that its dome
does not hit any adjacent parts, or it may be damaged.
- After replacing the magnetron, be sure to check the
microwave energy leakage with a leakage detector and
confirm the leakage is below 5 mW/cm2 .
D. REMOVING FUSE
(A) Remove the 8A fuse with a screwdriver.
- When replacing the 8A fuse, be sure to use an exact
repair part.
- If the 8A fuse blows immediately, check the primary
interlock switch and the interlock monitor switch (termi
nals “C” and “NC”) according to “CHECKOUT
PROCEDURE FOR SWITCHES” on page 8, and make
sure to check the microwave energy leakage according
to “1. ADJUSTMENT PROCEDURE” on page 1, when
the primary interlock switch or the interlock monitor
switch is replaced.
- If the primary interlock switch is defective, replace not
only the primary interlock switch but also the interlock
monitor switch.
Then install a new 8A fuse.
- If the primary interlock switch and the interlock monitor
switch (terminals “C” and “NC”) operate properly,
determine which of the following is defective: blower
motor, turntable motor, high voltage transformer, high
voltage capacitor, high voltage diode or magnetron.
- If the high voltage diode is defective , replace not
only the high voltage diode but also the HV fuse.
E. REMOVING DOOR
RETAINING
CLIPS
(1) Remove the 2 screws securing the upper hinge.
(2) Tilt the top of the door toward you.
(3) Lift up the door to remove it.
Figure 12
Interlock Switch Replacement - when replacing faulty
switches, be sure switch retaining clips are not bent,
broken or otherwise deficient in their ability to secure
the switches in place.
B. REMOVING THE ANTENNA
(See exploded view on page 15 )
(1). Remove the screw securing the cavity cover to the
cavity.
(2). Remove the antenna complete by slightly bending it
so the retension clips holding it slide out of the cavity
wall.
When replacing the door body or door assembly
the new door has to be set properly ensuring the correct
door gap between door body and cavity front.
To set the new door;
1. Mount door loosely on cavity.
2. Before tigthening the top and bottom hinge screws
place feeler gauges (the thickness varies for different
models- see table below) between the door assembly and
the cavity front plate between the top and bottom hinges.
NB. Be careful not to scratch the door cover with the feeler gauges.
3. The door should then be aligned with the control base
and held firmly in place leaving a gap within 1-2mm.
between the door cover and control base.
-13-
4. The hinge screws should then be tightened to hold the
door in place, and the feeler gauges removed.
5. The door gap should then be checked again using feeler
gauges.
Below is a table giving the door setting for the:EM-SL20N
(3) Remove power cord from cavity assembly by
lifting cord bush, moving it to the left and pulling it
away from cavity rear plate.
(4) Install the new power supply cord with the
reverse procedure of above (1) to (3).
WARNING
For changing the power supply cord, never use parts
other than the following :
Part Name : Power Supply Cord Assembly
Part No : 617 213 2990 (Continental)
DOOR GAP
Lower Limit Upper Limit
0.2mm.
0.8mm.
After setting the door gap, the door is closed with the door
latch fully engaged and the screws securing the switch
base are loosened. The switch base is then eased to the
right to pull the door face hard onto the front of the
microwave. The screws are then secured tight. To check if
the operation has been carried out correctly push the door
top and bottom. Any movement should be minimal, and
the door should feel tight to the front face of the
microwave.Confirm that the operation has been successfully carried out by depressing the door release lever until
the microswitches are heard to operate. This occurs just
before the door opens.
NOTES
- After replacing the door, be sure to check that the
primary interlock switch, door sensing switch and the
interlock monitor switch operate normally. (See
page 1).
- After replacing the door check for microwave energy
leakage with a leakage detector.
Microwave energy leakage must be below the limit of
5mW/cm2.
H. REMOVING TURNTABLE MOTOR COVER
(Refer to Figures 13 and 14 below )
(1) Turn the unit and cut the 6 joints of the bottom
plate and the motor cover using diagonal pliers
(nipper). (See Figure 13 )
(2) Seperate the motor cover and the bottom plate.
NOTES
- Bend the cut joints inside slightly for safety and be
careful of the sharp edges.
RE-INSTALL :
(1) Rotate the motor cover through 180˚.
(2) Insert the edge of the motor cover into the tab on
the bottom plate.
(3) Secure the motor cover by screwing it to the
bottom plate (See Figure 14 )
Use screw 411 156 5502 (not supplied with oven)
F. DISASSEMBLYING DOOR
( See exploded view on page 18 )
(1) Insert a thin flat blade screwdriver between the
choke dielectric and the door mainframe and lift
up the choke dielectric to release the hooks one
by one.
(2) To remove door cover, remove the 2 screws
securing the door cover to the door main frame
(3) Insert a thin flat blade screwdriver between the
door cover and door mainframe and release the
hooks one by one.
(4) To detach the glass door panel, insert a thin flat
blade screwdriver between the door panel and
door cover and release the clips one by one.
NOTES
- The choke dielectric, the glass door panel and the
door cover may be damaged when they are removed.
When re-installing them, replace them with new ones
if they are damaged.
- After installing the door in place, check for microwave
energy leakage with a leakage detector.
Microwave energy leakage must be below the limit of
5mW/cm2.
Clip metal here
and at other 5
locations.
Metal Tabs
Retaining Lugs
Figure13
Insert screw here to
secure.
G. CHANGiNG POWER SUPPLY CORD
(See exploded view on page 16 )
Tabs fit into
retaining lugs.
(1) Removing the earthing screw.
(2) Remove the power supply cord from the terminal
of PCB complete.
-14-
Figure14
8. EXPLODED VIEW AND PARTS LIST
CAVITY PARTS
2
2
15
2
2
13
1
14
16
19
2
11
12
17
10
3
18
9
8
4
5
7
6
EM-SL20N
Key
Part No.
No.
1 617 220 4376
2 411 156 5601
3 MO-A0730
4 MO-S1121
5 411 001 6005
6 MO-R0132
7 617 184 7659
8 617 215 9560
9 617 167 1421
10 MO-A0737
11 617 169 8930
12 412 037 5901
Description
Cabinet
SCR TPG PAN+F+S 4x10
Cavity
Gear Motor
SCR S-TPG PAN 4x8
Special Washer
Turntable Shaft
Roller Base Ass'y
Glass Tray
Antenna Complete
Cavity Cover
SCR TPG TRS 4x6K
Q'ty
Key
No.
13
14
15
16
17
18
19
1
7
1
1
2
1
1
1
1
1
1
1
-15-
Part No.
617 221 0025
617 202 4554
617 167 0431
617 169 6875
617 166 2153
617 170 5058
411 010 5600
Description
Heater Complete
Thermostat, 150˚C
Duct
Frame Rear Plate
Cook Net (H)
Cook Net (L)
SCR EVR PAN 3x6
Q'ty
1
1
1
1
1
1
1
SWITCHES AND MICROWAVE PARTS
5
3
3
3
27
2
6b
6a
26
19
3
14
13
7
28
25
18
3
20
4
24
1
21
22
8
15
17
9
3
16
10
12
11
EM-SL20N
Key
No.
1
2
3
4
5
6a
6b
7
8
9
10
11
12
13
14
15
16
Part No.
411 010 5600
411 156 5601
411 156 5502
411 171 9004
617 213 2990
617 179 0746
423 027 8802
617 167 0417
617 162 2041
MO-S0856
MO-S0947AS
617 234 1934
617 182 2915
617 229 3769
MO-S1118
617 112 1025
MO-M1211
Description
SCR EVR PAN 3x6
SCR TPG PAN+F+S 4x10
SCR S-TPG PAN+F+S 4x10
SCR TPG TRS+FLG 3x8
Power Supply Cord
PCB Complete (N-F)
Fuse
Space Partition
Capacitor Band
Capacitor 1.14uF
Diode Ass'y
Lead Wire Ass'y
HV Fuse
Blower Motor
Magnetron
Fan
Duct
Q'ty
1
1
6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Key
No.
17
18
19
20
21
22
24
25
26
27
28
-16-
Part No.
617 195 3428
617 189 0839
617 244 0651
617 244 0644
617 244 0651
MO-S0587
617 202 4561
617 220 1757
617 218 9673
411 004 5609
402 071 0703
Description
Latch Lever
Lever Stopper
Door Sensing Switch
Interlock Monitor Switch
Primary Interlock Switch
Lamp Ass'y
Thermostat V122˚C
Stay Plate
Special Screw
NUT HEX M4
Ceramic Resistor
Q'ty
1
1
1
1
1
1
1
1
4
1
1
MICROWAVE PARTS
1
3
6
5
8
2
2
4
7
EM-SL20N
Key
No.
1
2
3
4
5
6
7
8
Part No.
617 209 4557
617 225 1721
617 225 6153
-----------------617 144 5435
617 166 7493
411 156 5602
617 102 7495
Description
Transformer
Special Screw
Bottom Plate Assembly
Gear Motor Cover
Foot Cushion Assembly
Bottom Hinge
SCR S-TPG PAN+F+S 4x10
Special Screw
-17-
Q'ty
1
2
1
1
4
1
1
2
DOOR PARTS
Inner Door Panel always
supplied with Door Main Frame
but can be ordered seperately
quoting number below.
3
2
1
4
5
6
EM-SL20N
Key
No.
1
2
Part No.
MO-A0748
MO-A0768
Description
*
3
4
5
6
617 144 2472
617 167 0189
617 167 1292
617 195 3411
617 101 1494
Door Cover Assembly
Door Main Frame(Supplied
with inner Door Panel)
Glass Inner Door Panel
Hinge
Choke Dielectric
Door Latch
Spring
*
MO-A0756
Door Assembly
Q'ty
1
1
1
1
1
1
1
1
NB. Please refer to the detailed instructions for door
setting on page 14 of the service manual before
changing, adjusting or repairing these parts.
-18-
CONTROL PANEL PARTS
4
1
11
3
2
11
6
10
13
7
12
9
8
EM-SL20N
Key
No.
1
2
3
4
6
7
8
9
10
11
12
13
*
*
Part No.
Description
Q'ty
MO-A0749
617 236 6463
617 219 5520
617 224 0275
617 197 4836
617 181 7980
MO-A0747
617 188 3329
617 224 1067
411 064 6608
617 231 3047
617 331 3047
Control Base Assembly
Knob Body
PCB Complete
PCB Complete
PCB Complete
Latch Lever
Handle Assembly
Spring
Knob Assembly
SCR TPG BIN 3x8
Special Nut (Metal)
Special Nut (Resin)
1
1
1
1
1
1
1
1
1
11
1
1
MO-P5257
MO-P5276
Operating Instructions (EES)
Carton Box
1
1
* These items not illustrated
-19-
10.CONTROL CIRCUIT BOARD
EM-SL20N
Model
EM-SL20N
Spares No.
617 224 0275
RL3
Yes
M.Processor
IC11 LM8842
49700
TP1
TP2
-24-
C2
HEATER
THERMO
-21-
D14
PT1 PD5TK-S150
C15
1000P
/50V
D12
D13
C13
470u
/35V
ZD12
ZD13
Q12
D15
B123B 1N4002
R1
4
C11
470u
/35V
R1
3
3
Q11
A564A
ZD11
RD5.6ESB3
R12 2.7K
R11
4.7K
C16
0.01u
/50V
RD7.5ESB3 X2
C14
0.01u
/50V
1
D103
1N4002
D102
-15V
R117
10K
C103
0.01u
50V
BZ1
2KHZ
10K
10K
10K
D107
D109
-5V
C107
0.1u
/25V
OPEN
OPEN
OPEN
C106
0.01u
50V
VL1
93 AVSS
40 VSS
13 P55/CNTR1
91 VCC
92 VREF
C1
100 C2
1
24 P42/INTO
2
VL3
99 VL2
98
P62/AN2
8
P63/AN3 7
33
32
31
30
29
28
41
42
43
44
45
Q101
DTA123X
OPEN
OPEN
R56 12K
R54 12K
38
39
XIN
XOUT
R301 10K
16
14
15
1
3
2
SW6
7
6 SW5
5
4
2.2K
-5V
RS1
4MHZ
R102
10K
10K
-5V
ZD101
RD3.9
ESB2
R101
1K
SW9-2
-15V
SW11
SW10
SW14
SW13
SW12
16
1
MORE/
LESS
AUTO
A.DEF
MICRO
START POWER
QUICK
START
KITCHEN
TIMER
GRILL
1-4 COM1-4
5-27
39-28
DELAY
START
GRILL
150W
GRILL
450W
S101
52045-1645
S103
52044-1645
SW BOARD
(12700)
CLEAR/
STOP
14 15
SW8
SW4 SW9-1
SW3
12
13
9
8
10
11
8
9
6 11
7 10
12 13
SW2
3 2
R132
TIMER SW
4.7K X5
R131
3
5 4
R130
R302 10K
-5V
4
23
12
2
1
S301 EH3P
R151
390Ω
LED1 LED2 LED3 LED4 LED5
Q151
A564A
R52 12K
R153
1.2K
R152
10K
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
R125 10K
R126 10K
R12710K
R12810K
R129 10K
R304
10K
R303
10K
R101
100K x5
-5V
C302
1000P
/50V
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
C301
1000P
/50V
R103
C101 560K
1µ
D101
/50V
RST 35
P80 37
P81 36
P70 34
P66/AN6 4
P67/AN7 3
P77 27
P71
P72
P73
P74
P74
P75
P76
P27
P26
P24
P24
P23
COM0-3 97-94
SEG0-22 90-68
SEG23-34 67-58
55
P11/SEG35 54
P12/SEG36 53
P13/SEG37 52
P14/SEG38 51
P15/SEG39
P16 50
P17 49
P20 48
P21 47
P22 46
P56/TOUT
15 P53
16 P52
17 P51
Q106
DTA143X
14 P54
23 P43
25 P41
26 P40
22 P44
21 P45
20 P46
18 P50
19 P47
-5V
10 P60/AN0
5 P65/AN5
6 P64/AN4
9
P61/AN1
11
P57
Q107
DTA143X
4.7K
12
R120
10K
10K
OPEN
OPEN
OPEN
4.7K
OPEN
OPEN
10K
-5V
D111
R121
10K
R122
100K
R123
100K
R124
100K
2.2K
Q104
DTA123Y
OPEN
D108
Q103
OPEN
2.2K DTA123Y
Q108 A564A
R119
10K
-5V
R118
10K
R105 4.7K
R140 4.7K
C102
0.01u
/50V
Q102 OPEN
2.2K DTA123Y
R104
10K
R116
1K
R114
150Ω
R115 3.3K
D110
RL1
R112
4.7K
R110 R111
18Ω x 2
R108 R109
18Ω x 2
R106 R107
18Ω x 2
-5V
C12
47u
/10V
-15V
Q105
C1741
R113
CL 47K
1
OPEN
OPEN
OPEN
OPEN
IC 11 LM8842
D11
1N4002 X4
S1 3/5P
53062-0310 5
HIGH VOLTAGE CONDENSER
2x500PF/2x1.5uH
INRUSH
RESISTOR
D106
GRILL
HEATER
INRUSH
D105
BM
GM
RL2
MQ
D104
DOOR
SENSING
SWITCH
S102
5267-03A
2
CL
HIGH VOLTAGE RECTIFIER
RL3
RL2
RL4
MQ/OVEN
THERMO
FUSE
8A(T)
GRILL
HEATER
CAPACITOR
HIGH VOLTAGE TRANSFORMER
MONITOR SWITCH
R
C3
L1,L2 = 1mH
C1 = 0.22µF
C2,C3 = 4700PF C1
R = 1MΩ
MAGNETRON
PRIMARY
SWITCH
V5T1
L2
RL1
L1
SW BOARD
(31900)
LCD1 H4062
230V
50Hz
11. OVERALL CIRCUIT DIAGRAM
EM-SL20N
Please Note
All the information that appears in this service manual was
correct at the time of production. SANYO Electric Company
reserves the right to make changes to parts or processes in
order to maintain their policy of continuing improvement.
2002-09